Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D33/00—Details of, or accessories for, sacks or bags
  • B65D33/01—Ventilation or drainage of bags

Definitions

• the invention relates to a ventable bag, comprising a flat web of a bag material, which is formed by overlapping its two opposite longitudinal edge regions to form a tube whose one end is closed or formed as a bottom, wherein the bag material is substantially impermeable to air, but in partial surfaces each of the overlapping longitudinal edge regions having perforation holes, wherein the perforation holes are offset in one longitudinal edge region opposite the perforation holes in the other, overlapped longitudinal edge region, and the longitudinal edges of the overlapped longitudinal edge regions of the bag material web are fastened by means of a connecting seam to the respectively adjacent and overlapping layer of the bag material ,
• Vented bags are widely used for storage of bulk materials, for example, as sacks for cement and other powdery materials.
• a known method for filling powdery materials in bags is to transport the powder by means of a stream of compressed air into the bags and to close this after the introduction of the powder in the bag.
• the bags so filled in addition to the powdery contents also contain large amounts of air, which give the bags a balloon-like shape. This balloon-like shape prevents stacking of the filled sacks, since such a stack would inevitably slip.
• the stacking is essential for economical transport of the filled bags.
• Another problem of bags filled with bulk goods, in which undesired air is trapped is that the bag tends to burst when pressure is applied from the outside and the contents are thus lost.
• an air-permeable bag material is used in the simplest case according to the prior art.
• a per se airtight bag material can be provided with perforations to remove trapped air from the filled bag can.
• both solutions have the significant disadvantage that with the air flowing out through the perforations even small particles of the contents are entrained, the bag is so leaking for the contents. This is of course generally undesirable, but especially in those cases where chemically aggressive product or product is packed, which reacts chemically with water.
• 5-ply paper bags are known, which are produced so that first a paper web is needled, then the needled paper web is folded and glued to five bag bodies of different sizes, then the five bag bodies inserted into each other and glued together at least at their open edges ,
• the present invention provides a solution to the problems outlined, which involves both significant material savings and excellent auto-manufacturing in a few processing steps and high throughput.
• the invention is characterized by the development of a bag mentioned above in such a way that the perforation holes in the overlapped longitudinal edge region have a formation and / or arrangement for smaller air passage than the perforation holes in the overlapping longitudinal edge region by perforation holes in the overlapping longitudinal edge region with a larger cross-sectional area than those in the overlapped Longitudinal edge region are formed and / or in the overlapping longitudinal edge region per unit area a larger number of perforation holes is formed as in the overlapped longitudinal edge region.
• longitudinal edge region is to be understood as an area of the sack material web which can extend from the respective longitudinal edge of the web or close to it up to one third of the web width towards the web center.
• a plastic bag which has two overlapping longitudinal edges, which are fixed by longitudinal weld seams on the sack track, so that an air chamber is formed between the overlapped longitudinal edges. Both longitudinal edges have a series of perforation holes, wherein the perforation holes in a
• Longitudinal edge are offset from the perforation holes in the other longitudinal edge, so that a labyrinthine air passage is formed.
• the size or size of the perforation holes in both longitudinal edges are not defined.
• JP 2000 177 750 A discloses a household bag with a venting area which is designed so that the penetration of pests and dirt into the bag is prevented as far as possible.
• a hose is formed from an airtight film, which has an overlap of the film edges in the longitudinal direction.
• the overlapping foils are connected in sections in two rows at intervals by welding, wherein the welds of the two rows are offset from each other.
• the films themselves have no perforation holes, but only one vent slot is formed between the film ends.
• a package comprising a sheet of synthetic resin having two opposite longitudinal edges and perforated portions near the longitudinal edges, the sheet being folded so that the perforated portions overlap and the opposite longitudinal edges of the folded sheet overlap Track sections are welded, above or below which they lie. Between the overlapped portions of the web is a layer of material (e.g., paper) which is permeable to a sterilizing gas but impermeable to microbes.
• material e.g., paper
• GB 2 025 894 A discloses a sack with two overlapped perforated regions between which a microporous filter layer is located. Data on air passage conditions in the overlapped perforated areas or on an offset of the perforation holes are not found in this document.
• a non-generic packaging container with a degassing valve is known, which is formed from a multilayer packaging material with a flexible outer layer, wherein the individual layers are firmly connected except in the region of the degassing valve. In the area of the degassing valve, the layers lie loosely on one another and form a longitudinally closed channel. This channel communicates with the interior of the container through a breakthrough in the inner layer. The breakthroughs in the inner layer should act as a filter against the contents in the bag.
• EP 0 444 261 B1 is a flexible packaging container in the form of a bag or bag made of air-impermeable plastic film or the like. with an air outlet region in a bag wall, wherein the outer wall part is provided with perforations for an air passage from the filling space of the bag and the perforated bag material is covered on the inside by a perforated inner wall part.
• the air permeability of the inner wall part is higher than that of the outer wall part by appropriate design and configuration of the perforation.
• Inner wall part and outer wall part define an air chamber closed on all sides.
• the air chamber is inflated due to the different air permeabilities of the inner wall and outer wall with air during filling of the Ve ⁇ ackungs electnisses with air-laden filling, which is pressed back into the filling space of the container and thus the perforations of the inner wall part inwardly cleans.
• the construction of this packaging container is thus in contrast to the subject invention.
• the shape of the bag according to the invention is not limited in detail, however, a so-called box-bag or a box-valve bag is often preferred for bulk solids.
• a bag material of the invention is preferably plastic film, plastic fabric or paper used.
• the connecting seam consists of an adhesive layer, a weld, an extrusion layer of thermoplastic material or a hot melt adhesive layer, all of which can be excellently applied automatically. It is not necessary for both seams to be airtight. Instead, it is sufficient if only the connecting seam of the bag material longitudinal edge located on the outside of the bag with the bag material layer lying against it is airtight.
• the overlap of the longitudinal edge regions of the sack material accounts for up to 50% of the bag circumference, resulting in a material saving of at least 50% (compared to 2-layer sacks) compared to the sacks of the prior art.
• plastic webs and microporous plastic films have proven to be particularly suitable filter materials for the purpose according to the invention, wherein preferably plastic films are stretched films with mineral inclusions.
• the latter films are made of thermoplastic polymers, in which the mineral inclusions are embedded. When the film is stretched mono- or biaxially, the polymers, but not the mineral inclusions, expand and hair cracks are intentionally formed in the film, through which air can escape.
• a method according to the invention for producing a ventable bag comprises the following steps: a) the provision of a flat, substantially air-impermeable, web-shaped bag material; b) perforating the web-shaped sack material along two spaced-apart regions of the sack material such that the two perforated regions have the same or different air permeability, wherein preferably the perforation regions of the web-shaped sack material lie near its longitudinal edges; c) cutting the web-shaped bag material to a predetermined length; d) the at least partially overlapping of the perforated regions of the sack material over its length, so that the holes in the perforated regions are offset from each other and the perforation holes in the overlapped longitudinal edge region an education and / or arrangement for maximally equal, preferably smaller air passage than the perforation holes in have overlapping longitudinal edge region; e) connecting the longitudinal edges of the bag material with the respective overlapped position of the bag material adjacent thereto; f)
• the cutting step can be carried out before the perforation of the web, or even after the overlapping of the perforated regions, or even after the production of the connecting seams between the bag material edges and the material layer applied thereto.
• a filter material is introduced between the overlapped perforated regions of the bag material.
• the bag material provided is selected from plastic film, plastic fabric and paper.
• the joining of the longitudinal edges of the bag material with the respective overlapped position of the bag material adjacent thereto preferably comprises gluing, welding, extruding thermoplastic material or applying hot melt glue.
• Figures IA, IB, IC, ID show the production of a first embodiment of a bag according to the invention in different manufacturing steps, wherein Fig. IA is a flat path of a bag material in plan view, Fig. IB the blind path connected to a tube in cross-section, Fig. IC is a cross section through the finished folded bag and Fig. ID represent the bag in perspective.
• Figures 2A, 2B, 2C, 2D show the production of a second embodiment of a bag according to the invention in different manufacturing steps, wherein Fig. 2 A is a flat path of a bag material in plan view, Fig. 2B connected to a hose sack track in cross-section, Fig. 2C a Cross section through the finished folded bag and Fig. 2D illustrate the bag in perspective.
• FIG. 3 shows a variant of FIG. 2B of the tube-shaped bag material web in cross-section.
• 4A, 4B, 4C, 4D show the production of a further embodiment of a bag according to the invention in various production steps, wherein FIG. 4A shows a flat path of a bag material in plan view, FIG. 4B shows the bag path connected to a tube in cross section, FIG. 4C shows a cross section through the finished folded bag and Fig. 4D represent the bag in perspective.
• FIG. 5A, 5B, 5C, 5D show the production of a further embodiment of a bag according to the invention in different production steps, wherein FIG. 5A shows a flat path of a bag material in plan view, FIG. 5B shows the bag path connected to a tube in cross section, FIG. 5C shows a cross section through the finished folded bag and Fig. 5D illustrate the bag in perspective.
• a flat sheet 1 of a bag material for producing a bag according to the invention is shown in plan view.
• the bag material is airtight or made airtight by treatment material, such as coated or uncoated paper, plastic film, or coated plastic fabric.
• the web 1 is already cut to the appropriate length and has opposite longitudinal edges Ia, Ib and a central longitudinal axis Ic. Partial surfaces Id, Ie, which, viewed from the longitudinal edges Ib, Ia, can extend across a width of up to one third of the width of the sack material web 1, are entrained by a needling process, such as pulling through the sack material web through the nip between two needle rollers Perforations have been provided, which allow the passage of air.
• FIG. 1B it is to be seen in cross-section how the longitudinal edge regions of the sack material web 1 have been overlapped over their entire length (ie, the direction of the longitudinal axis Ic) such that the perforated faces Id, Ie are superimposed. It can be clearly seen from FIG.
• the perforation holes Ih in the perforated partial area Ie are offset relative to the perforation holes Ig in the perforated partial area Id, whereby labyrinthine passages are created for escaping air through which the air can pass, but in which trapped entrained particles of contents.
• the perforation holes Ih are slightly larger than the perforation holes Ig, so that the overlapping region Ie of the sack material passes more air than the overlapped region Id.
• the region of the sack material web 1, in which two layers of material lie one above the other, has a width b1 which is approximately equal to that of FIG half width of a front surface 10c of a bag 10 corresponds (see Fig. ID).
• FIG. 1C and FIG. 1D show, in cross-section and in perspective, a box sack 10 which has been folded from the tubularly connected sack material web 1 of FIG. 1B to form a bottom 10a (see FIG. ID). It can be seen that the overlapping area 10b, through which the venting of the bag 10 takes place, occupies approximately half the width and the entire length of the front surface 10c.
• FIGS. 2A, 2B, 2C, 2D show the production of a further bag 20 according to the invention in various production steps, again assuming a flat web 1 of a bag material.
• This embodiment differs from the embodiment of FIGS. IA to ID only in that the perforated partial surfaces Ii, Ij are made substantially wider so that the overlapping of these surfaces results in a width b2 which is approximately 45% of the circumference of the sack 20 accounts.
• the overlapping area 20b occupies not only the entire front surface 20c of the bag 20, but also almost half of the side surfaces 20d. If necessary, as shown in Fig.
• this filter material 4 preferably comprises a plastic fleece or a stretched plastic film with mineral inclusions, in the stretching process at the interface Hairline cracks have been formed between plastic and the mineral inclusions.
• FIGS. 4 A, 4 B, 4 C, 4 D show the production of a further bag 40 according to the invention in various production steps, again assuming a flat web 1 of a bag material.
• This embodiment differs from the embodiment of Figures IA to ID in that four perforated faces Ik, U, Im, are provided in which are designed much shorter than in the first embodiment, wherein the overlapping of these areas again takes place in a width bl , which corresponds to about half the width of the bag front surface. From FIG. 4D, it can be seen that two overlapping areas 4Of, 40g have thus been formed, which are separated from each other in the center of the front surface of the bag 40.
• 5A, 5B, 5C, 5D show the production of a further bag 50 according to the invention in various production steps, again assuming a flat web 1 of a bag material.
• This embodiment has four mutually parallel perforated partial surfaces lo, Ip, Ir, Is, wherein lying on the same side with respect to the longitudinal axis Ic partial surfaces lo, Ip and Ir, Is have a distance of b3 to each other, the total overlap occurs in a width b2.
• the bag 50 has two overlapping areas 50h, 50j, each extending the full length of the front surface of the bag 50, each overlap area 50h, 50j extending over less than half the width of the front surface of the bag (such that there is a web 50i therebetween) Sack material is formed) and in addition over almost half of an adjacent narrow side 50k, 501 extends.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bag Frames (AREA)
• Sampling And Sample Adjustment (AREA)
• Medicines Containing Plant Substances (AREA)
• Air Bags (AREA)
• External Artificial Organs (AREA)
• Orthopedics, Nursing, And Contraception (AREA)

Applications Claiming Priority (1)

Publications (2)

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Family Applications (1)

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• 2005
  • 2005-07-08 AT AT05758994T patent/ATE411229T1/de active
  • 2005-07-08 CN CNA200580051015XA patent/CN101223084A/zh active Pending
  • 2005-07-08 EP EP05758994A patent/EP1910176B1/fr not_active Not-in-force
  • 2005-07-08 JP JP2008519768A patent/JP2009500251A/ja active Pending
  • 2005-07-08 WO PCT/AT2005/000259 patent/WO2007006060A1/fr active Application Filing
  • 2005-07-08 DE DE502005005724T patent/DE502005005724D1/de active Active
  • 2005-07-08 BR BRPI0520431-3A patent/BRPI0520431A2/pt not_active IP Right Cessation
• 2008
  • 2008-01-08 EG EGNA2008000041 patent/EG24698A/xx active

Non-Patent Citations (1)

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